How many flights depart from Region of Ontario to Illinois on average per day?

As of September 2025, 108 flights take off from Region of Ontario and land in Illinois each day. The most common flight departure time for this route is 6:00a.m., with 46% of daily flights taking off at noon.

How many flights depart from Region of Ontario to Illinois on average per week?

760 flights are operational weekly from Region of Ontario to Illinois as of September 2025. The most popular departure day for this route is Thu, with 15% of flights per week taking off on this day.

How long is the flight from Region of Ontario to Illinois?

The average flight duration from Region of Ontario to Illinois depends on which airport you fly into and out of. Flying from Ottawa to Chicago O'Hare Intl Airport is 2h 08m on average, while flying from Toronto to Chicago O'Hare Intl Airport is 6h 11m on average. Chicago O'Hare Intl Airport is the most popular airport in Illinois.

What is the cheapest airline that flies from Ontario to Illinois?

Porter Airlines, Air Canada, and WestJet are the most popular carriers operating from Ontario to Illinois

Which airlines fly to Illinois?

Air Canada, United Airlines and Porter Airlines are the top three most popular airlines that fly to Illinois from Region of Ontario according to our data. Air Canada is the first choice among our users, with 62% of people opting to fly with this airline when travelling to Illinois. Keep in mind that there are 5 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Ontario to Illinois?

Prices for flights from Ontario to Illinois are refreshed on a daily basis.

How many operators does momondo search for flights from Ontario to Illinois?

There are 6 operators available for flights from Ontario to Illinois as of September 2025.

How old do you have to be to fly from Ontario to Illinois?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Ontario to Illinois.

What documentation or ID do you need to fly to Illinois?

The necessary travel and health documents for your Illinois trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

C$ 185 Cheap Flights from Ontario to Illinois in 2025/26

1 adult

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Early arrival? Instantly customize your results

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Ontario to Illinois

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

6:30 a.m. - 6:38 p.m.YYZ-ORD

13h 08m1 stop

7:43 p.m. - 2:05 p.m.ORD-YYZ

17h 22m1 stop

C$ 296Multiple Airlines

Find Deal

Wed, 15 Oct - Wed, 22 Oct

4:00 p.m. - 3:49 p.m.YYZ-ORD

24h 49m1 stop

5:05 a.m. - 2:40 p.m.ORD-YYZ

8h 35m1 stop

C$ 299Multiple Airlines

Find Deal

Sun, 19 Oct - Fri, 31 Oct

6:15 p.m. - 8:00 p.m.YUL-ORD

2h 45mdirect

12:50 p.m. - 3:57 p.m.ORD-YUL

2h 07mdirect

C$ 336Air Canada

Find Deal

Sat, 1 Nov - Sat, 8 Nov

1:10 p.m. - 4:24 p.m.YUL-MDW

4h 14m1 stop

9:35 a.m. - 4:00 p.m.MDW-YUL

5h 25m1 stop

C$ 338Porter Airlines

Find Deal

Fri, 17 Oct - Wed, 22 Oct

1:10 p.m. - 4:24 p.m.YUL-MDW

4h 14m1 stop

5:20 p.m. - 10:15 p.m.MDW-YUL

3h 55m1 stop

C$ 339Porter Airlines

Find Deal

Wed, 8 Oct - Wed, 15 Oct

6:15 p.m. - 8:00 p.m.YUL-ORD

2h 45mdirect

3:55 p.m. - 9:52 p.m.ORD-YUL

4h 57m1 stop

C$ 353Air Canada

Find Deal

Sat, 1 Nov - Sat, 8 Nov

6:15 a.m. - 8:01 a.m.YUL-ORD

2h 46mdirect

7:11 a.m. - 10:40 a.m.ORD-YUL

2h 29mdirect

C$ 358United Airlines

Find Deal

Thu, 16 Oct - Sat, 18 Oct

4:55 p.m. - 6:41 p.m.YUL-ORD

2h 46mdirect

7:11 a.m. - 10:40 a.m.ORD-YUL

2h 29mdirect

C$ 365United Airlines

Find Deal

Thu, 9 Oct - Sun, 12 Oct

7:50 a.m. - 12:04 p.m.YUL-ORD

5h 14m1 stop

8:44 p.m. - 1:34 p.m.ORD-YUL

15h 50m1 stop

C$ 405American Airlines

Find Deal

Wed, 15 Oct - Fri, 17 Oct

2:29 p.m. - 11:37 p.m.YUL-ORD

10h 08m1 stop

11:49 a.m. - 3:11 p.m.ORD-YUL

2h 22mdirect

C$ 418American Airlines

Find Deal

Fri, 7 Nov - Mon, 10 Nov

WestJet flights from Region of Ontario to Illinois

Our best WestJet deals on Region of Ontario to Illinois flight tickets

WestJet

1 Nov

YYZ6:20 a.m.Toronto Pearson Intl

5h 10m

1 stop

MDW10:30 a.m.Chicago Midway

8 Nov

MDW3:00 p.m.Chicago Midway

7h 18m

1 stop

YYZ11:18 p.m.Toronto Pearson Intl

C$ 332

Find similar

WestJet

17 Oct

YYZ8:00 a.m.Toronto Pearson Intl

9h 43m

1 stop

ORD4:43 p.m.Chicago O'Hare Intl

19 Oct

ORD5:30 p.m.Chicago O'Hare Intl

12h 17m

2 stops

YYZ6:47 a.m.Toronto Pearson Intl

C$ 335

Find similar

WestJet

17 Oct

YYZ8:00 a.m.Toronto Pearson Intl

9h 43m

1 stop

ORD4:43 p.m.Chicago O'Hare Intl

19 Oct

ORD5:30 p.m.Chicago O'Hare Intl

12h 17m

2 stops

YYZ6:47 a.m.Toronto Pearson Intl

C$ 339

Find similar

Air Canada flights from Region of Ontario to Illinois

Our best Air Canada deals on Region of Ontario to Illinois flight tickets

Air Canada

1 Nov

YUL6:15 p.m.Montreal Pierre Elliott Trudeau Intl

2h 45m

ORD8:00 p.m.Chicago O'Hare Intl

8 Nov

ORD12:50 p.m.Chicago O'Hare Intl

2h 07m

YUL3:57 p.m.Montreal Pierre Elliott Trudeau Intl

C$ 336

Find similar

Air Canada

1 Nov

YUL6:15 p.m.Montreal Pierre Elliott Trudeau Intl

2h 45m

ORD8:00 p.m.Chicago O'Hare Intl

8 Nov

ORD3:55 p.m.Chicago O'Hare Intl

4h 57m

1 stop

YUL9:52 p.m.Montreal Pierre Elliott Trudeau Intl

C$ 353

Find similar

Air Canada

1 Nov

YUL8:50 a.m.Montreal Pierre Elliott Trudeau Intl

7h 20m

2 stops

ORD3:10 p.m.Chicago O'Hare Intl

8 Nov

ORD7:15 a.m.Chicago O'Hare Intl

2h 05m

YUL10:20 a.m.Montreal Pierre Elliott Trudeau Intl

C$ 360

Find similar

Fly from

Fly to

Route

Depart

Return

Price

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Wed 15/10

6:30 a.m.-6:38 p.m.

1 stop13h 08m

Chicago O'Hare Intl

Wed 22/10

7:43 p.m.-2:05 p.m.

1 stop17h 22m

C$ 296

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Sun 19/10

4:00 p.m.-3:49 p.m.

1 stop24h 49m

Chicago O'Hare Intl

Fri 31/10

5:05 a.m.-2:40 p.m.

1 stop8h 35m

C$ 299

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Sat 1/11

6:15 p.m.-8:00 p.m.

Nonstop2h 45m

Chicago O'Hare Intl

Sat 8/11

12:50 p.m.-3:57 p.m.

Nonstop2h 07m

C$ 336

MontrealChicago

YUL - MDW

YULMDW

Montreal Pierre Elliott Trudeau Intl

Fri 17/10

1:10 p.m.-4:24 p.m.

1 stop4h 14m

Chicago Midway

Wed 22/10

9:35 a.m.-4:00 p.m.

1 stop5h 25m

C$ 338

MontrealChicago

YUL - MDW

YULMDW

Montreal Pierre Elliott Trudeau Intl

Wed 8/10

1:10 p.m.-4:24 p.m.

1 stop4h 14m

Chicago Midway

Wed 15/10

5:20 p.m.-10:15 p.m.

1 stop3h 55m

C$ 339

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Sat 1/11

6:15 p.m.-8:00 p.m.

Nonstop2h 45m

Chicago O'Hare Intl

Sat 8/11

3:55 p.m.-9:52 p.m.

1 stop4h 57m

C$ 353

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Thu 16/10

6:15 a.m.-8:01 a.m.

Nonstop2h 46m

Chicago O'Hare Intl

Sat 18/10

7:11 a.m.-10:40 a.m.

Nonstop2h 29m

C$ 358

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Thu 9/10

4:55 p.m.-6:41 p.m.

Nonstop2h 46m

Chicago O'Hare Intl

Sun 12/10

7:11 a.m.-10:40 a.m.

Nonstop2h 29m

C$ 365

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Wed 15/10

7:50 a.m.-12:04 p.m.

1 stop5h 14m

Chicago O'Hare Intl

Fri 17/10

8:44 p.m.-1:34 p.m.

1 stop15h 50m

C$ 405

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Fri 7/11

2:29 p.m.-11:37 p.m.

1 stop10h 08m

Chicago O'Hare Intl

Mon 10/11

11:49 a.m.-3:11 p.m.

Nonstop2h 22m

C$ 418

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Region of Ontario to Illinois

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the cheapest month to fly to Illinois?

In general, July is the cheapest month to fly from Region of Ontario to Illinois. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around C$ 299. If you don’t want to visit Illinois in July, then you should wait until June to fly from Region of Ontario, when ticket prices are also cheap, with an average price of C$ 310.

What is the cheapest day to depart on your flight to Illinois?

According to our data, Friday is the cheapest day to fly to Illinois from Region of Ontario. The lowest ticket price found for a Friday departure recently was C$ 737. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. The most expensive day to fly to Illinois is Tuesday, with ticket prices averaging around C$ 1,178.

What is the cheapest time of day to depart on your flight to Illinois?

Our most recent data shows that the best time of day to fly to Illinois is in the evening. Flights from Region of Ontario to Illinois during this time can be as low as C$ 626. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are C$ 1,276 on average. Flights to Illinois from Region of Ontario in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

What is the cheapest Ontario to Illinois flight route?

Fly from Toronto Island to Chicago Midway for the best Ontario - Illinois flight prices

How far in advance should I book a flight to Illinois?

You are more likely to see cheaper flights to Illinois from Region of Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around C$ 402 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Region of Ontario for as low as C$ 298 on momondo.

What cabin class options are available on Ontario to Illinois flights?

There are 4 cabin classes available to choose from on Ontario to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Region of Ontario to Illinois flights?

No. A direct flight is the cheapest option for a flight between Region of Ontario to Illinois.

Cheap Region of Ontario to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Region of Ontario to Illinois

Best price found	C$ 211
Fastest flight time	1h 49m
Direct flights	Every day
Airports in Illinois	1 airport

The best one-way flight to Illinois from Region of Ontario in the past 72 hours is C$ 211. The best round-trip flight deal from Region of Ontario to Illinois found on momondo in the last 72 hours is C$ 240.

The fastest flight from Region of Ontario to Illinois takes 1h 49m

Direct flights go from Region of Ontario to Illinois every day.

There is 1 airport near Illinois: Chicago Midway (MDW)

Search flight deals

When did momondo last update prices for flights from Ontario to Illinois?
Prices for flights from Ontario to Illinois are refreshed on a daily basis.
How many operators does momondo search for flights from Ontario to Illinois?
There are 6 operators available for flights from Ontario to Illinois as of September 2025.
How old do you have to be to fly from Ontario to Illinois?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Ontario to Illinois.
What documentation or ID do you need to fly to Illinois?
The necessary travel and health documents for your Illinois trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Region of Ontario to Illinois?
momondo data reveals that the most frequently booked plane model on the route from Region of Ontario to Illinois is De Havilland (Bombardier) DHC-8-400 Dash 8Q, representing 19.39% of all bookings. The subsequent popular models are Embraer 175 (Enhanced Winglets) at 15.55%, Boeing 737-800 at 12.07%, and Embraer 175 at 7.98%.

Best airlines flying from Region of Ontario to Illinois

Compare and see reviews for airlines that fly from Region of Ontario to Illinois with momondo

Airline	Rating	Free Cancellation	Price
Porter Airlines	PriceFrom C$ 196	Free Cancellation	Rating 7.9 365 reviews	Search Porter Airlines flights
Air Canada	PriceFrom C$ 263	Free Cancellation	Rating 7.1 10,000 reviews	Search Air Canada flights
American Airlines	PriceFrom C$ 267	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
United Airlines	PriceFrom C$ 278	Free Cancellation	Rating 7.4 8,926 reviews	Search United Airlines flights
WestJet	PriceFrom C$ 381	Free Cancellation	Rating 7.2 3,095 reviews	Search WestJet flights

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Illinois?

It is quick and easy to find Ontario to Illinois flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Illinois that suits you.

Can I find flights from Ontario to Illinois with flexible booking policies on momondo?

Flights from Ontario to Illinois with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Ontario to Illinois?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Illinois from Ontario.

I’m not ready to book a flight from Ontario to Illinois right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Illinois from Ontario. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.